Dosage of exercises for the development of jumping in schoolchildren from 7 to 11 grade

My work gives an answer to the main question for teachers of physical culture. It is not advisable to give repetitions when developing the jumping ability: in 7 classes more than 12 repetitions, in 8 classes - 14, in 9 grades -13, 10 grades -17, in 11 classes - 20. And it was also established experimentally: 1. Active movement of hands gives an increase in result by 2-6 cm. 2. Low results at the first attempts indicate the need for a proper warm-up. 3. With age, hopping endurance increases.